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WWI Bob: 4004 Big Boy Locomotive, Cheyenne, Wyoming
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WWI Bob: Tender for the 4004 Big Boy Locomotive
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WWI Bob: Rear View of Tender for 4004 Big Boy Locomotive
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WWI Bob: Big Boy 4004 and Sign
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WWI Bob: Cab of 4004 Big Boy Locomotive
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WWI Bob: Big Boy 4004 Steam Locomotive
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WWI Bob: Big Boy Locomotive 4004
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WWI Bob: Build Plate for Big Boy 4004 Locomotive
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WWI Bob: Big Boy Locomotive 4004, Cheyenne, Wyoming
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WWI Bob: List of Big Boy Locomotives and Their Locations